Practice questions for Exum Page 6 of B 35. Which are the aromatic amino aclds?

Question

Practice questions for Exum Page 6 of B 35. Which are the aromatic amino aclds? 36. Which amino acids do not have dissociable R Gateral) groups and therefore 37. Which one is realy an Liminoci?anw 38. Which amino acids have non-polar lateral groups? 39. Which amino acids have a basic lateral group (l.e. pka8)? Histidine wil not have pkas? pkapKa pkas 2.34 Amino acld 9.69 9.62 Valine 2.32 2.36 2.28 1.99 10.60 Proline 9.13 1.83 283 9.39- 2.02 8.80 2.17 Phenylalanine 2.09 220 1.96 1.88 2.19 967 425 2188.9510.53 2.179.0412.48 9.13 9.15 9.10 9.11 8.18 9.60 Tyrosine Aspartic acid Gutamic acid 3.65 9.17 6.00 40. In a protein, the sequence (or order) of its component amino acids (actually amino acyl residues) is called A) primary structure B) secondary structure C) tertiary structure E) None of the above 41. The hemoglobin tedramer (2HDA/2HbB) is said to have quatemary structure True B) False amino acids would contribute to forming bridge salts in protein secondary and tertliary structures: 42 A) Arginine, Lysine, Glutamic Acid, Aspartic Acid B) Methionine. C) Serine, Threonine D) Tryptophan, Tyrosine, Phenylalanine E) None of the above 43. The study of chemical reactions in cels is useful in the study of metabolism. What is metaboliam? A) All reactions in the cells or an organism that produce energy. B) All blosynthetic (anabolic) reactions in a cel C) Reactions taking place in the organelles of eukaryotic cells. D) The sum of all blochemical reactions that take place in cells, tissues, organs, or whole organisms E) Those reactions in the cell in which macromolecules are digested to their monomer components.

Explanation / Answer

35. Phenylalanine

Tryptophan

Tyrosine

Histidine.

36. The major of the standard amino acids are diprotic molecules since they have two dissociable protons: one on the alpha amino group and other on the alpha carboxyl group. There is no dissociable proton in the R group. This type of amino acid is called a " simple amino acid". A simple amino acid is electrically neutral under physiological conditions.

37. Alanine

38. Hydrogen.

40. None of the above.

41. True.

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